Question 5: For system shown below, estimate: 1. The head, flow rate, and efficiency in case of combined pumps in parallel and series. 2. At which configuration should the system be operated? 3. In case pump 2 is turned-off, estimate the shut-off head and free delivery flow rate in the system 40 20 Hp (m) 100 80 60 Pump 2 Pump 1 Efficiency curve 100 200 Combined in series Combined in parallel. 300 Eff. 90% 80% 70% 60% 50% 40% 30% 400 Q(L/min)

Question 5: For system shown below, estimate: 1. The head, flow rate, and efficiency in case of combined pumps in parallel and series. 2. At which configuration should the system be operated? 3. In case pump 2 is turned-off, estimate the shut-off head and free delivery flow rate in the system 40 20 Hp (m) 100 80 60 Pump 2 Pump 1 Efficiency curve 100 200 Combined in series Combined in parallel. 300 Eff. 90% 80% 70% 60% 50% 40% 30% 400 Q(L/min)

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

A wastewater pump of 30 cm impeller has a characteristics curve defined by the formula: H= 13.6-0.83g Where H in meters, Q in m'/min, It is designed to operate at 705 rpm, It will operate at the best efficiency point with flooded suction (water at the top of pump volute). The system head capacity curve can be described as follows: H- 5+0.43Q parabola Where H: in meters, Q in m'/min. The head losses in the suction pipe amount to 0.8m and the cavitation constant is 0.2. Check for cavitation assuming the pump is located at sea level, the vapor pressure is 3.17 kpa
Part 1 Part 2 Part 3 hp A centrifugal pump having a 7.5-in-diameter impeller and the characteristics shown in the figure below is to be used to pump gasoline through 4000 ft of commercial steel 3-in.-diameter pipe. The pipe connects two reservoirs having open surfaces at the same elevation. Determine the flowrate. Do you think this pump is a good choice? This figure is referred to as the pump performance characteristics. 500 8 in. dia 400 7 出300 6 Head, ft 200 100 65 60 55 50 40 bhp 30 25 20 80 ° 40 120 160 200 240 280 320 Capacity, gal/min Write the system equation for this flow system as function of the friction factor f and volume flowrate Q in gal/min. (Use 2 significant digits on coefficients. Do not enter units as a part of your response.)
1. A Rankine cycle with reheating has a throttle pressure of 135 bars at the turbine inlet and 28 bars reheat pressure, the throttle and reheat temperature of the steam is 550C, condenser pressure is 0.035 bar, mass flow rate of steam is 10 kg/sec. Draw the T-s and schematic diagram of the cycle and determine the following: (f) actual work of the pump if pump isentropic efficiency is 89% (g) actual turbine work if turbine isentropic efficiency is 90%
EXAMPLE 14–2 Selection of Pump Impeller Size A washing operation at a power plant requires 370 gallons per minute (gpm) of water. The required net head is about 24 ft at this flow rate. A newly hired engineer looks through some catalogs and decides to purchase the 8.25-in impeller option of the Taco Model 4013 FI Series centrifugal pump of Fig. 14-15. If the pump operates at 1160 rpm, as specified in the per- formance plot, she reasons, its performance curve intersects 370 gpm at H = 24 ft. The chief engineer, who is very concerned about efficiency, glances at the performance curves and notes that the efficiency of this pump at this operating point is only 70 percent. He sees that the 12.75-in impel- ler option achieves a higher efficiency (about 76.5 percent) at the same flow rate. He notes that a throttle valve can be installed downstream of the pump to increase the required net head so that the pump operates at this higher efficiency. He asks the junior engineer to justify her…
SITUATION 2 (For this situation, there are no choices but you can input your answers in google forms later) Calculate the following if the amount of flow is 1.26m³/s, the 80% efficient pump delivers 1073kW, and the turbine is 92% efficient. EL. 120.50 C-110 0.60m-diameter 360m EL 77.90 C-110 0.60mdiameter 45.60m P 556m 14. Compute for the energy given by the pump 15. Total Head Loss
A laboratory has installed a double-suction, three-stage, centrifugalpump with a discharge of 330 gpm under 200 ft head and running at 1200 rpm. It isproposed to install another pump with double suction and six stages, but of the samecharacteristics, to operate at 98 ft head and deliver 430 gpm. Calculate a) the speed ofthe proposed pump; b) the impeller diameter of the proposed pump if the diameter of theexisting pump is 6 inches; and c) the type of the existing and the proposed pump.
A. For the system shown in the figure, select the proper pump that has the best efficiency to raise 12 m³ of water from the lower tank to the upper one. The time targeted for the process to be completed at least in 60 mins. The pump is located at zero elevation. Make your calculations at the minimum allowed depth in the lower tank (i.e. 1 m). What would be the efficiency and actual flow rate? Head (m) 35 30 25 20 15 B. Using your recommended pump, how long does it take the pump to elevate 12 m³ if the water level in the lower tank is fixed at 3 m. 40 10 5 0 - 0 Pump 3 Pump 2 Pump 1 0.001 Max: +3 m 0.002 Min: +1 m I I 60% 70% 80% 90% T I 1 I I + T 1 I I + I CHw = 150 D = 100 mm 0.003 Flow (m³/s) T I I + 1 T L=10 m +16 m 0.004 L = 16 m ooo oo ロロ 0.005 0.006
The centrifugal pump has to work with the following specifications: Static suction head: 3 m Static delivery head: 8 m Length of suction pipe: 7m Length of delivery pipe: 10 m Discharge: 850 lpm Working fluid: Water at 30°C A3 The pump is directly connected to an electric motor. Design the pump completely for pumping water.
Gasoline (v = 4.06 E-7 m2/s) flows at 0.9 L/s %3D through a 100-mm-diameter pipe. Describe the type of flow.
Non-positive displacement pump is the type of pump whose size is lesser for a given discharge räte. Select one O True O False
Question II Liquid of sp.gr and It is required to flow this liquid through a piping system connected to a tank as shown in Fig. with a flowrate Q. There are five available pumps with different maximum head which of them is suitable for this system? What power must supply to the pump if its efficiency is n=0.6? is in a closed tank with air at pressure measured by a mechanical gauge. Manometer Pumps Ahmax-1 sp.gr. sp.gr. PAir hi h2 h3 Ahmax-2 Ahmax-3 Ahmax-4 Ahmax-5 (kPa-G) (m) (m) (m) (m) (m) (m) (m) (m) liquid 0.85 oil 0.78 2595 30 15 20 16 35 60 130 210 Piping System (Le/d): (Le/d)v Valve (h:)H.Ex. (m) Hlig Z2 L1 L2 L4 d. Q P° e (poise) (m) (m) (km) (km) (cm) (mm) Elbow (1/min) (kPa) 0.032 42 12 14 0.8 10.3 0.125 60 200 680 100.95 14 PAir Closed L4 Oil Air h3 h2 Z2 L2 Z1 Liquid Н.Ех. wwww Hg 5)
The pipeline shown in the figure A. takes water from a reservoir and terminates in a nozzlehaving a jet diameter of 2 inches. With the pipe losses shown in the figure, and assuming anozzle loss of (a) 8.76 %, (b) 10.67 % of the velocity head in the jet. Compute the dischargeand make a table showing the elevation head, pressure head, and total head at each of thesix stations